Electrical connection



W. H. YOUNG.

ELECTRICAL CONNECTION.

APPLICATION man MAR. 19, I913.

Patented July 1, 1919.

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ELECTRICAL CONNECTION.

Specification of Letters Patent.

Patented July 1, 1919.

Application filed March 19, 1913. Serial No. 755,469.

T 0 all whom it may concern I Be it known that I, VILBUR H. YOUNG, acitizen of the United States of America, residing in Keyport, inthecounty of Monmouth, State of New Jersey, have invented certain new anduseful Improvements in Electrical Connections, of which the following isa specification.

This invention relates to pigtail brushes for electrical machines andmore particularly to a novel electrical connection, or pig tail, and tothe manner of fastening the same to the brush.

The object of the invention is to provide a cheaply manufactured andefficient connection that can be easily'and quickly applied to a brushand can be repeatedly used with new brushes as the old brushes wear out.

To this end I have provided a 'connection or pig tail having an innerexpansible terminal adapted to be tightly expanded in an opening,without special form, )rovided in' the brush, thus forming an e cientelectrical contact with the brush.

This terminal is adapted to be repeatedly expanded and contracted,whereby it is adapted to be used with new brushesas the old ones wearoutas many times as desired.

In the accompanying drawing, showing, by way of example, several of,many possible embodiments ofthe invention:

Figure 1 shows a brush, partly in section, and'an axial sectional viewof one form of a connection terminal applied to the brush, part of theconnection being shown in elevation;

Fig. 2 is a sectional view taken on the line 2-2 of Fig. 1;

Fig. 3 is a side elevation of the terminal in expanded condition;

Fig. 4 is a side elevation of the terminal, contracted and ready to beapplied to a brush;

Fig. 5 shows an axial section of another form of terminal;

Fig. 6 shows a section taken on the line 66 of Fig. 5, and

Fig. 7 shows an axial sectional view, artly in elevation, of anotherform of the invention;

Theterminals illustrated in Figs. l to 7 comprise resilient corrugatedsplit sleeve 10 adapted to be expanded in the bore 11 provided at anyconvenient point in the brush 12. This bore may be drilled withanyordinary standard twist drill of the required size.

All of the terminals shown are provided with a flexible cable 1 1 havingan outer clip, 15.

eferring more particularly to Figs. 1 to 4, the inner end of the cable14 has pinched or otherwise secured thereon an end expanding cone 16;while slidable on an intermediate part of the cable is a movableexpanding cone. 18; both cones having their smaller ends pointing towardeach other.

The terminal is assembled with its parts as shown in Fig. 4, and as thusarranged the elasticity of the sleeve contracts it to its smallestdiameter, and the terminal is ready .to be inserted in the bore 11 ofthe brush,

after which the expanding cones are driven toward each other, bypressure on the movable cone, and the parts of the terminal assume therelation shown in Figs. 1 to 3, the sleeve being tightly expandedagainst the walls of the bore and efi'ecting therewith good electricalcontact.

In the form of the invention illustrated in Figs. 5 and 6, the endexpanding cone 26, pinched or soldered on the endv of the cable, has anouter conical surface with the smaller end pointing toward the slidablesplit expander 28 which has an inner conical surface 29 adapted toreceive the outer conical surface of the end cone 26. The parts beingassembled as shown, the terminal may be readily expanded in the bore 11of the brush by driving the parts 26 and 28 nearer together.

It is to be noted that the parts 26 and 28 may both be split and may bemade of strips of spring metal.

In the form of terminal shown in Fig. 7, the end cone 36 is the movablecone and has screw threaded engagement with the stem 37 which may beintegral with or otherwise secured to the fixed cone 38 provided with anengaging portion 39 by which the cone 38 may be turned, by asuitable'tool or by hand, to cause the cones 36 and 38 to move nearertogether and expand the sleeve 10 or to move apart and cause the sleeveto con-.

tract. By this arrangement, the terminal may be secured in the bore orremoved therefrom. The cable 14 may be soldered in a hole in the largerend of the cone 38.

The terminal illustrated in Fig. 7 may be removed from the brushes,whenrenewing the brushes, by manipulating the terminals as explained. Inall the forms of the invention, when a brush is worn out, it can bebroken off from the terminal, and the terminal applied to a new brush.

The various parts of the electrical connections forming the subject ofthis invention may be made of copper, brass or any material which may befound suitable, and the said connections may be used for forming anyconnections for which they maybe found suitable.

\Vhile herein I have described minute details of the invention, theinvention is not limited to these; and the details of construction,arrangement and operation may be greatly varied without departing fromthe spirit and scope of the invention as claimed.

I claim as my invention:

1. An electrical connection comprising an elastic one-piece split sleeveof approximately constant diameter; a pair of inwardly pointinginter-engaging cones in said sleeve; and a flexible conductorpermanently connected. to one of said cones and along which the othercone is adapted to slip for assembling the connection.

2. An electrical connection comprising a pair of inter-engagingone-piece cones; and a conductor passed axially through said cones andhaving one end permanently secured to the inner cone, the conductorbeing freely flexible, whereby the outer cone can freely slide upon theconductor and the assembled connection inserted in a bore closed at oneend, and the connection then tightened the outer cone being elastic;

3. An electrical connection comprising a pair of inter-engagingone-piece cones; and a conductor passed axially through said cones andhaving one end permanently secured to the inner cone, the conductorbeing freely flexible, the outer cone being elastic.

4. An electrical connection comprising an electrical conductor having acylindrical opening, closed at one end and of substantially uniformdiameter; a pair of interengaging one-piece cones entirely Within theopening; and a freely flexible conductor passing through one cone andsecured to the other, said cones being adapted for in: sertion withinthe opening while they are assembled on the flexible conductor.

5. An electrical connection comprising an elastic one-piece splitsleeve; a pair of inwardly pointing cones therein; a freely flexiblecable passing axially through both cones and secured directly to one ofthe cones.

In testimony whereof I hereto aflix my signature in the presence of twowitnesses.

'WILBUR H. YOUNG.

lVitnesses:

N. CHAMP IGN, 'S. B. WILLIAMs.

